/**
 * Copyright 2010 Longyi Qi
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

#import <Foundation/Foundation.h>

#import "NGHeader.h"

@class PBGeneratedMessage;
@class PBUnknownFieldSet;
@class PBCodedInputStream;
@class PBCodedOutputStream;
@class NGHost;
@class NGProtoCallback;

@interface NGSequencedProtoChannel : NSObject {
	NSMutableDictionary *_expectedMessages;
	NGHost *host;
	NGProtoCallback *callback;
	
	NSInputStream *_inputStream;
	NSOutputStream *_outputStream;
	PBCodedInputStream *_pbInputStream;
	PBCodedOutputStream *_pbOutputStream;
}

@property (retain) NGHost *host;
@property (retain) NGProtoCallback *callback;

- (id) initWithHost:(NGHost *)aHost callback:(NGProtoCallback *)aCallback;

- (void) expectMessage:(PBGeneratedMessage *)messagePrototype;
- (PBGeneratedMessage *) getMessagePrototype:(NSString *)messageType;

- (void) sendMessage:(long)sequenceNo message:(PBGeneratedMessage *)message withExpectedResponsePrototype:(PBGeneratedMessage *)expectedPrototype;
- (void) sendMessage:(long)sequenceNo message:(PBGeneratedMessage *)message;

- (void) startAsyncRead;

- (BOOL) isStreamOpen:(NSStream *)stream;
- (BOOL) isConnected;

@end
